test.py

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import ObjectProperty
from kivy.uix.label import Label
from kivy.uix.recycleview import RecycleView
from kivy.clock import Clock
from kivy.uix.button import Button

kv = """
<Row>:
    id: row
    canvas.before:
        Color:
            rgba: 0.5, 0.5, 0.5, 1
        Rectangle:
            size: self.size
            pos: self.pos
<Test>:
    canvas:
        Color:
            rgba: 0.3, 0.3, 0.3, 1
        Rectangle:
            size: self.size
            pos: self.pos
    orientation: 'vertical'
    RecycleView:
        id: rvlist
        scroll_type: ['bars', 'content']
        scroll_wheel_distance: dp(114)
        bar_width: dp(10)
        viewclass: 'Row'
        RecycleBoxLayout:
            default_size: None, dp(56)
            default_size_hint: 1, None
            size_hint_y: None
            height: self.minimum_height
            orientation: 'vertical'
            spacing: dp(2)

<TestRoot>:
    Test:
        pos_hint: {"center_x": .5, "center_y": .5}
"""

Builder.load_string(kv)

class Row(BoxLayout):
    row_content = ObjectProperty()


    def __init__(self,**kwargs):
        super(Row, self).__init__(**kwargs)
        Clock.schedule_once(self.finish_init,0)

        
    def finish_init(self, dt):
        for elt in self.row_content:
            self.add_widget(Label(text = elt))
        self.bind(row_content = self.update_row)


    def update_row(self, *args):
        self.clear_widgets()
        for elt in args[1]:
            self.add_widget(Label(text = elt))

    def on_touch_down(self, touch):
        super(Row, self).on_touch_down(touch)

        if self.collide_point(*touch.pos):
            print(self.row_content)
            print(touch)
            print(App.get_running_app().root_window.mouse_pos)
            print(touch.spos)
            spos_button = Button(text="SPOS", pos_hint={"x": touch.spos[0], "y": touch.spos[1]}, size_hint=(.1, .1))
            pos_button = Button(text="POS", pos=touch.pos, size_hint=(None, None))
            window_pos_button = Button(text="Window POS", pos=App.get_running_app().root_window.mouse_pos, size_hint=(None, None))
            App.get_running_app().root.add_widget(spos_button)
            App.get_running_app().root.add_widget(pos_button)
            App.get_running_app().root.add_widget(window_pos_button)
        
class Test(BoxLayout):
    
    def __init__(self,**kwargs):
        super(Test, self).__init__(**kwargs)
        Clock.schedule_once(self.do_new_data)

    def do_new_data(self, *args):
        self.ids.rvlist.data = [{'row_content': [str(i) for i in range(5)]} for x in range(15)]


class TestRoot(FloatLayout):
    pass

class TestApp(App):
    def build(self):
        return TestRoot()

if __name__ == '__main__':
    TestApp().run()